config.mk

   1 #
   2 # (C) Copyright 2000-2013
   3 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 #
   5 # SPDX-License-Identifier:      GPL-2.0+
   6 #
   7 #########################################################################
   8
   9 # Set shell to bash if possible, otherwise fall back to sh
  10 SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
  11         else if [ -x /bin/bash ]; then echo /bin/bash; \
  12         else echo sh; fi; fi)
  13
  14 export  SHELL
  15
  16 ifeq ($(CURDIR),$(SRCTREE))
  17 dir :=
  18 else
  19 dir := $(subst $(SRCTREE)/,,$(CURDIR))
  20 endif
  21
  22 ifneq ($(OBJTREE),$(SRCTREE))
  23 # Create object files for SPL in a separate directory
  24 ifeq ($(CONFIG_SPL_BUILD),y)
  25 ifeq ($(CONFIG_TPL_BUILD),y)
  26 obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/)
  27 else
  28 obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
  29 endif
  30 else
  31 obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
  32 endif
  33 src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
  34
  35 $(shell mkdir -p $(obj))
  36 else
  37 # Create object files for SPL in a separate directory
  38 ifeq ($(CONFIG_SPL_BUILD),y)
  39 ifeq ($(CONFIG_TPL_BUILD),y)
  40 obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/)
  41 else
  42 obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
  43
  44 endif
  45 $(shell mkdir -p $(obj))
  46 else
  47 obj :=
  48 endif
  49 src :=
  50 endif
  51
  52 # clean the slate ...
  53 PLATFORM_RELFLAGS =
  54 PLATFORM_CPPFLAGS =
  55 PLATFORM_LDFLAGS =
  56
  57 #########################################################################
  58
  59 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
  60                   $(HOSTCPPFLAGS)
  61
  62 #
  63 # Mac OS X / Darwin's C preprocessor is Apple specific.  It
  64 # generates numerous errors and warnings.  We want to bypass it
  65 # and use GNU C's cpp.  To do this we pass the -traditional-cpp
  66 # option to the compiler.  Note that the -traditional-cpp flag
  67 # DOES NOT have the same semantics as GNU C's flag, all it does
  68 # is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
  69 #
  70 # Apple's linker is similar, thanks to the new 2 stage linking
  71 # multiple symbol definitions are treated as errors, hence the
  72 # -multiply_defined suppress option to turn off this error.
  73 #
  74
  75 ifeq ($(HOSTOS),darwin)
  76 # get major and minor product version (e.g. '10' and '6' for Snow Leopard)
  77 DARWIN_MAJOR_VERSION    = $(shell sw_vers -productVersion | cut -f 1 -d '.')
  78 DARWIN_MINOR_VERSION    = $(shell sw_vers -productVersion | cut -f 2 -d '.')
  79
  80 os_x_before     = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
  81         $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
  82
  83 # Snow Leopards build environment has no longer restrictions as described above
  84 HOSTCC           = $(call os_x_before, 10, 5, "cc", "gcc")
  85 HOSTCFLAGS      += $(call os_x_before, 10, 4, "-traditional-cpp")
  86 HOSTLDFLAGS     += $(call os_x_before, 10, 5, "-multiply_defined suppress")
  87 else
  88 HOSTCC          = gcc
  89 endif
  90
  91 ifeq ($(HOSTOS),cygwin)
  92 HOSTCFLAGS      += -ansi
  93 endif
  94
  95 #########################################################################
  96 #
  97 # Option checker, gcc version (courtesy linux kernel) to ensure
  98 # only supported compiler options are used
  99 #
 100 CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk
 101 CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o
 102
 103 -include $(CC_OPTIONS_CACHE_FILE)
 104
 105 cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \
 106                 if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \
 107                 > /dev/null 2>&1; then \
 108                 echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
 109                 echo "$(1)"; fi)
 110
 111 ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y)
 112 cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2))
 113 else
 114 cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\
 115                 $(if $(call cc-option-sys,$1),$1,$2)))
 116 endif
 117
 118 # cc-version
 119 # Usage gcc-ver := $(call cc-version)
 120 cc-version = $(shell $(SHELL) $(SRCTREE)/scripts/gcc-version.sh $(CC))
 121 binutils-version = $(shell $(SHELL) $(SRCTREE)/scripts/binutils-version.sh $(AS))
 122 dtc-version = $(shell $(SHELL) $(SRCTREE)/scripts/dtc-version.sh $(DTC))
 123
 124 #
 125 # Include the make variables (CC, etc...)
 126 #
 127 AS      = $(CROSS_COMPILE)as
 128
 129 # Always use GNU ld
 130 LD      = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
 131                 then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;)
 132
 133 CC      = $(CROSS_COMPILE)gcc
 134 CPP     = $(CC) -E
 135 AR      = $(CROSS_COMPILE)ar
 136 NM      = $(CROSS_COMPILE)nm
 137 LDR     = $(CROSS_COMPILE)ldr
 138 STRIP   = $(CROSS_COMPILE)strip
 139 OBJCOPY = $(CROSS_COMPILE)objcopy
 140 OBJDUMP = $(CROSS_COMPILE)objdump
 141 RANLIB  = $(CROSS_COMPILE)RANLIB
 142 DTC     = dtc
 143 CHECK   = sparse
 144
 145 #########################################################################
 146
 147 # Load generated board configuration
 148 ifeq ($(CONFIG_TPL_BUILD),y)
 149 # Include TPL autoconf
 150 sinclude $(OBJTREE)/include/tpl-autoconf.mk
 151 else
 152 ifeq ($(CONFIG_SPL_BUILD),y)
 153 # Include SPL autoconf
 154 sinclude $(OBJTREE)/include/spl-autoconf.mk
 155 else
 156 # Include normal autoconf
 157 sinclude $(OBJTREE)/include/autoconf.mk
 158 endif
 159 endif
 160 sinclude $(OBJTREE)/include/config.mk
 161
 162 # Some architecture config.mk files need to know what CPUDIR is set to,
 163 # so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
 164 # Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
 165 # CPU-specific code.
 166 CPUDIR=arch/$(ARCH)/cpu/$(CPU)
 167 ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
 168 CPUDIR=arch/$(ARCH)/cpu
 169 endif
 170
 171 sinclude $(TOPDIR)/arch/$(ARCH)/config.mk       # include architecture dependend rules
 172 sinclude $(TOPDIR)/$(CPUDIR)/config.mk          # include  CPU  specific rules
 173
 174 ifdef   SOC
 175 sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk   # include  SoC  specific rules
 176 endif
 177 ifdef   VENDOR
 178 BOARDDIR = $(VENDOR)/$(BOARD)
 179 else
 180 BOARDDIR = $(BOARD)
 181 endif
 182 ifdef   BOARD
 183 sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk  # include board specific rules
 184 endif
 185
 186 #########################################################################
 187
 188 # We don't actually use $(ARFLAGS) anywhere anymore, so catch people
 189 # who are porting old code to latest mainline but not updating $(AR).
 190 ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR)
 191 RELFLAGS= $(PLATFORM_RELFLAGS)
 192 DBGFLAGS= -g # -DDEBUG
 193 OPTFLAGS= -Os #-fomit-frame-pointer
 194
 195 OBJCFLAGS += --gap-fill=0xff
 196
 197 gccincdir := $(shell $(CC) -print-file-name=include)
 198
 199 CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)         \
 200         -D__KERNEL__
 201
 202 # Enable garbage collection of un-used sections for SPL
 203 ifeq ($(CONFIG_SPL_BUILD),y)
 204 CPPFLAGS += -ffunction-sections -fdata-sections
 205 LDFLAGS_FINAL += --gc-sections
 206 endif
 207
 208 ifneq ($(CONFIG_SYS_TEXT_BASE),)
 209 CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
 210 endif
 211
 212 ifeq ($(CONFIG_SPL_BUILD),y)
 213 CPPFLAGS += -DCONFIG_SPL_BUILD
 214 ifeq ($(CONFIG_TPL_BUILD),y)
 215 CPPFLAGS += -DCONFIG_TPL_BUILD
 216 endif
 217 endif
 218
 219 # Does this architecture support generic board init?
 220 ifeq ($(__HAVE_ARCH_GENERIC_BOARD),)
 221 ifneq ($(CONFIG_SYS_GENERIC_BOARD),)
 222 CHECK_GENERIC_BOARD = $(error Your architecture does not support generic board. \
 223 Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file)
 224 endif
 225 endif
 226
 227 ifneq ($(OBJTREE),$(SRCTREE))
 228 CPPFLAGS += -I$(OBJTREE)/include
 229 endif
 230
 231 CPPFLAGS += -I$(TOPDIR)/include -I$(SRCTREE)/arch/$(ARCH)/include
 232 CPPFLAGS += -fno-builtin -ffreestanding -nostdinc       \
 233         -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
 234
 235 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
 236
 237 ifdef BUILD_TAG
 238 CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"'
 239 endif
 240
 241 CFLAGS_SSP := $(call cc-option,-fno-stack-protector)
 242 CFLAGS += $(CFLAGS_SSP)
 243 # Some toolchains enable security related warning flags by default,
 244 # but they don't make much sense in the u-boot world, so disable them.
 245 CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \
 246                $(call cc-option,-Wno-format-security)
 247 CFLAGS += $(CFLAGS_WARN)
 248
 249 # Report stack usage if supported
 250 CFLAGS_STACK := $(call cc-option,-fstack-usage)
 251 CFLAGS += $(CFLAGS_STACK)
 252
 253 BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
 254
 255 ifeq ($(findstring examples/,$(BCURDIR)),)
 256 ifeq ($(CONFIG_SPL_BUILD),)
 257 ifdef FTRACE
 258 CFLAGS += -finstrument-functions -DFTRACE
 259 endif
 260 endif
 261 endif
 262
 263 # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
 264 # option to the assembler.
 265 AFLAGS_DEBUG :=
 266
 267 # turn jbsr into jsr for m68k
 268 ifeq ($(ARCH),m68k)
 269 ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
 270 AFLAGS_DEBUG := -Wa,-gstabs,-S
 271 endif
 272 endif
 273
 274 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
 275
 276 LDFLAGS += $(PLATFORM_LDFLAGS)
 277 LDFLAGS_FINAL += -Bstatic
 278
 279 LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
 280 ifneq ($(CONFIG_SYS_TEXT_BASE),)
 281 LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
 282 endif
 283
 284 LDFLAGS_$(SPL_BIN) += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
 285 ifneq ($(CONFIG_SPL_TEXT_BASE),)
 286 LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
 287 endif
 288
 289 # Linus' kernel sanity checking tool
 290 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 291                   -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
 292
 293 # Location of a usable BFD library, where we define "usable" as
 294 # "built for ${HOST}, supports ${TARGET}".  Sensible values are
 295 # - When cross-compiling: the root of the cross-environment
 296 # - Linux/ppc (native): /usr
 297 # - NetBSD/ppc (native): you lose ... (must extract these from the
 298 #   binutils build directory, plus the native and U-Boot include
 299 #   files don't like each other)
 300 #
 301 # So far, this is used only by tools/gdb/Makefile.
 302
 303 ifeq ($(HOSTOS),darwin)
 304 BFD_ROOT_DIR =          /usr/local/tools
 305 else
 306 ifeq ($(HOSTARCH),$(ARCH))
 307 # native
 308 BFD_ROOT_DIR =          /usr
 309 else
 310 #BFD_ROOT_DIR =         /LinuxPPC/CDK           # Linux/i386
 311 #BFD_ROOT_DIR =         /usr/pkg/cross          # NetBSD/i386
 312 BFD_ROOT_DIR =          /opt/powerpc
 313 endif
 314 endif
 315
 316 #########################################################################
 317
 318 export  HOSTCC HOSTCFLAGS HOSTLDFLAGS CROSS_COMPILE \
 319         AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
 320 export  CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
 321
 322 #########################################################################
 323
 324 # Allow boards to use custom optimize flags on a per dir/file basis
 325 ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
 326 ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
 327 EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
 328 ALL_CFLAGS += $(EXTRA_CPPFLAGS)
 329
 330 # The _DEP version uses the $< file target (for dependency generation)
 331 # See rules.mk
 332 EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
 333                 $(CPPFLAGS_$(BCURDIR))
 334 $(obj)%.s:      %.S
 335         $(CPP) $(ALL_AFLAGS) -o $@ $<
 336 $(obj)%.o:      %.S
 337         $(CC)  $(ALL_AFLAGS) -o $@ $< -c
 338 $(obj)%.o:      %.c
 339 ifneq ($(CHECKSRC),0)
 340         $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $<
 341 endif
 342         $(CC)  $(ALL_CFLAGS) -o $@ $< -c
 343 $(obj)%.i:      %.c
 344         $(CPP) $(ALL_CFLAGS) -o $@ $< -c
 345 $(obj)%.s:      %.c
 346         $(CC)  $(ALL_CFLAGS) -o $@ $< -c -S
 347
 348 #########################################################################
 349
 350 # If the list of objects to link is empty, just create an empty built-in.o
 351 cmd_link_o_target = $(if $(strip $1),\
 352                       $(LD) $(LDFLAGS) -r -o $@ $1,\
 353                       rm -f $@; $(AR) rcs $@ )
 354
 355 #########################################################################